CVE-2021-27417: eCosCentric eCosPro RTOS Versions 2.0.1 through 4.5.3 are vulnerable to integer wraparound in function calloc

Routine

MEDIUM 4.6UPGRADE

CVE-2021-27417 is a medium-severity flaw (CVSS 4.6) affecting ecospro. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

eCosCentric eCosPro RTOS Versions 2.0.1 through 4.5.3 are vulnerable to integer wraparound in function calloc (an implementation of malloc). The unverified memory assignment can lead to arbitrary memory allocation, resulting in a heap-based buffer overflow.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.6 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-190
Published	2022-05-03
Last modified	2026-06-17

Publisher (CNA): ICS-CERT · Vendor: ecoscentric

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-05-03 21:15 UTCPublished CVE record published
2026-06-17 03:44 UTCUpdated Record last modified

ecoscentric ecospro UPGRADE

Affected: >= 2.0.1 and <= 4.5.3

Fixed in: newer than 4.5.3

Safe to downgrade to: a release before 2.0.1

1. Check installed version

apt-cache policy ecospro || rpm -q ecospro || ecospro --version

2. UPGRADE to newer than 4.5.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ecospro

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ecospro

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.0.1 (Debian / Ubuntu)

apt-cache madison ecospro sudo apt install ecospro=<VERSION_BEFORE_2.0.1> sudo apt-mark hold ecospro

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ecospro sudo dnf downgrade ecospro-<VERSION_BEFORE_2.0.1> sudo dnf versionlock add ecospro

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-27417?

ecospro: upgrade to newer than 4.5.3. Exact commands for each OS are on this page.

Is CVE-2021-27417 being exploited?

CVE-2021-27417 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-27417 affect?

CVE-2021-27417 affects ecospro. Severity is medium (CVSS 4.6). eCosCentric eCosPro RTOS Versions 2.0.1 through 4.5.3 are vulnerable to integer wraparound in function calloc (an implementation of malloc). The unverified memory assignment can lead to arbitrary memory allocation, resulting in a heap-based

How urgent is CVE-2021-27417?

Priority 28/100. No elevated risk signals yet.

References

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